TMD forecasts rain in 70% of southern Thailand on October 12
Southern Thailand faces flash-flood risks from heavy rain, while thundershowers are forecast for 30% of Bangkok and surrounding areas
- The Thai Meteorological Department (TMD) forecasts thundershowers over 70% of southern Thailand's east and west coasts on October 12.
- The forecast includes isolated heavy rain, prompting official warnings of potential flash floods and sudden runoff due to accumulated rainfall.
- Residents in the south, particularly those living near foothills, waterways, and low-lying areas, have been urged to be on alert.
The Thai Meteorological Department (TMD) forecast thundershowers over 70% of both southern coastal regions on October 12, 2026, with isolated heavy rain, warning that accumulated rainfall could trigger flash floods and sudden runoff. Parts of upper Thailand are also expected to experience thundershowers.The TMD’s 24-hour forecast covers the period from 6am on October 12 to 6am on October 13, Thai time.
Southern Thailand faces flash-flood risk
The TMD warned people in southern Thailand to be alert to heavy rain and accumulated rainfall, particularly those living near foothills, waterways and low-lying land. Floodwater could also collect in low-lying communities.
A high-pressure system, or cold air mass, from China is covering upper Thailand and the South China Sea, bringing easterly winds over the Gulf of Thailand, according to the TMD. A monsoon trough is also lying across the lower South.
Thundershowers forecast in all regions of Thailand
The TMD forecasts thundershowers in every region during October 12–13, with coverage ranging from 20% in the North and Northeast to 70% in both southern coastal regions. The regional outlook is as follows:
North: Thundershowers over 20% of the region, mainly in Mae Hong Son, Chiang Mai, Tak, Kamphaeng Phet, Phitsanulok and Phichit. Minimum temperatures of 20–25°C and maximums of 32–34°C, with easterly winds at 10–20km/h.
Northeast: Thundershowers over 20% of the region, mainly in Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani. Minimum temperatures of 20–24°C and maximums of 32–35°C, with northeasterly winds at 10–25km/h.
Central region: Thundershowers over 30% of the region, mainly in Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram. Minimum temperatures of 22–25°C and maximums of 30–34°C, with northeasterly winds at 10–20km/h.
East: Thundershowers over 30% of the region, mainly in Chonburi, Rayong, Chanthaburi and Trat. Minimum temperatures of 23–26°C and maximums of 32–35°C, with northeasterly winds at 10–30km/h. Waves below one metre, rising above two metres in thundershowers.
South, east coast: Thundershowers over 70% of the region, with isolated heavy rain in Phatthalung, Songkhla, Yala, Narathiwat and Nakhon Si Thammarat. Minimum temperatures of 21–25°C and maximums of 30–35°C, with variable winds at 10–30km/h. Waves below one metre, rising above two metres in thundershowers.
South, west coast: Thundershowers over 70% of the region, with isolated heavy rain in Phuket, Krabi, Trang and Satun. Minimum temperatures of 23–25°C and maximums of 32–34°C, with variable winds at 15–30km/h. Waves around one metre, rising above two metres in thundershowers.
Bangkok and surrounding areas: Thundershowers over 30% of the area. Minimum temperatures of 25–27°C and maximums of 33–35°C, with northeasterly winds at 10–20km/h.
Storm waves could exceed two metres in Andaman Sea and Gulf
Waves in the Andaman Sea and Gulf of Thailand could exceed two metres in areas affected by thundershowers, the TMD warned. Boat operators should proceed cautiously and avoid sailing through thundershowers.
